i2c .zip Algorithm for accessing an I2C bus.
i2c_faq .zip I2C FAQ by Vincent Himpe.
pci2c .zip Philips I2C monitoring program !! It uses the PC printerport.
pci2cbd .zip Schematic (only a few ports) for using the Philips I2C monitoring program.
On the The Hardware Book pages there's really a lot more info about all kinds
of connectors, cables and adapters.
Also look in the /micros section for I2C algorithms and hardware.
http://www.ping.be/~ping0751/i2c.htm is also a nice i2c place.